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authorLi Jun <jun.li@nxp.com>2018-11-15 15:12:47 +0100
committerKishon Vijay Abraham I <kishon@ti.com>2018-12-12 10:01:46 +0530
commitefe81bea891586680a928ea5dde40eb1fff34be2 (patch)
tree522700beecee473d39418189a0e321981a8bbcb6 /drivers/phy/freescale
parent3c2ce40b2fbb52b5e861f8664f5422d39f11b39e (diff)
downloadlwn-efe81bea891586680a928ea5dde40eb1fff34be2.tar.gz
lwn-efe81bea891586680a928ea5dde40eb1fff34be2.zip
phy: add driver for Freescale i.MX8MQ USB3 PHY
This is a cleaned up port of the downstream i.MX8MQ USB3 PHY driver. Signed-off-by: Li Jun <jun.li@nxp.com> Signed-off-by: Lucas Stach <l.stach@pengutronix.de> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Diffstat (limited to 'drivers/phy/freescale')
-rw-r--r--drivers/phy/freescale/Kconfig5
-rw-r--r--drivers/phy/freescale/Makefile1
-rw-r--r--drivers/phy/freescale/phy-fsl-imx8mq-usb.c127
3 files changed, 133 insertions, 0 deletions
diff --git a/drivers/phy/freescale/Kconfig b/drivers/phy/freescale/Kconfig
new file mode 100644
index 000000000000..f050bd4e97e0
--- /dev/null
+++ b/drivers/phy/freescale/Kconfig
@@ -0,0 +1,5 @@
+config PHY_FSL_IMX8MQ_USB
+ tristate "Freescale i.MX8M USB3 PHY"
+ depends on OF && HAS_IOMEM
+ select GENERIC_PHY
+ default SOC_IMX8MQ
diff --git a/drivers/phy/freescale/Makefile b/drivers/phy/freescale/Makefile
new file mode 100644
index 000000000000..dc2b3f1f2f80
--- /dev/null
+++ b/drivers/phy/freescale/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_PHY_FSL_IMX8MQ_USB) += phy-fsl-imx8mq-usb.o
diff --git a/drivers/phy/freescale/phy-fsl-imx8mq-usb.c b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
new file mode 100644
index 000000000000..d6ea5ce8afa5
--- /dev/null
+++ b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c
@@ -0,0 +1,127 @@
+// SPDX-License-Identifier: GPL-2.0+
+/* Copyright (c) 2017 NXP. */
+
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+
+#define PHY_CTRL0 0x0
+#define PHY_CTRL0_REF_SSP_EN BIT(2)
+
+#define PHY_CTRL1 0x4
+#define PHY_CTRL1_RESET BIT(0)
+#define PHY_CTRL1_COMMONONN BIT(1)
+#define PHY_CTRL1_ATERESET BIT(3)
+#define PHY_CTRL1_VDATSRCENB0 BIT(19)
+#define PHY_CTRL1_VDATDETENB0 BIT(20)
+
+#define PHY_CTRL2 0x8
+#define PHY_CTRL2_TXENABLEN0 BIT(8)
+
+struct imx8mq_usb_phy {
+ struct phy *phy;
+ struct clk *clk;
+ void __iomem *base;
+};
+
+static int imx8mq_usb_phy_init(struct phy *phy)
+{
+ struct imx8mq_usb_phy *imx_phy = phy_get_drvdata(phy);
+ u32 value;
+
+ value = readl(imx_phy->base + PHY_CTRL1);
+ value &= ~(PHY_CTRL1_VDATSRCENB0 | PHY_CTRL1_VDATDETENB0 |
+ PHY_CTRL1_COMMONONN);
+ value |= PHY_CTRL1_RESET | PHY_CTRL1_ATERESET;
+ writel(value, imx_phy->base + PHY_CTRL1);
+
+ value = readl(imx_phy->base + PHY_CTRL0);
+ value |= PHY_CTRL0_REF_SSP_EN;
+ writel(value, imx_phy->base + PHY_CTRL0);
+
+ value = readl(imx_phy->base + PHY_CTRL2);
+ value |= PHY_CTRL2_TXENABLEN0;
+ writel(value, imx_phy->base + PHY_CTRL2);
+
+ value = readl(imx_phy->base + PHY_CTRL1);
+ value &= ~(PHY_CTRL1_RESET | PHY_CTRL1_ATERESET);
+ writel(value, imx_phy->base + PHY_CTRL1);
+
+ return 0;
+}
+
+static int imx8mq_phy_power_on(struct phy *phy)
+{
+ struct imx8mq_usb_phy *imx_phy = phy_get_drvdata(phy);
+
+ return clk_prepare_enable(imx_phy->clk);
+}
+
+static int imx8mq_phy_power_off(struct phy *phy)
+{
+ struct imx8mq_usb_phy *imx_phy = phy_get_drvdata(phy);
+
+ clk_disable_unprepare(imx_phy->clk);
+
+ return 0;
+}
+
+static struct phy_ops imx8mq_usb_phy_ops = {
+ .init = imx8mq_usb_phy_init,
+ .power_on = imx8mq_phy_power_on,
+ .power_off = imx8mq_phy_power_off,
+ .owner = THIS_MODULE,
+};
+
+static int imx8mq_usb_phy_probe(struct platform_device *pdev)
+{
+ struct phy_provider *phy_provider;
+ struct device *dev = &pdev->dev;
+ struct imx8mq_usb_phy *imx_phy;
+ struct resource *res;
+
+ imx_phy = devm_kzalloc(dev, sizeof(*imx_phy), GFP_KERNEL);
+ if (!imx_phy)
+ return -ENOMEM;
+
+ imx_phy->clk = devm_clk_get(dev, "phy");
+ if (IS_ERR(imx_phy->clk)) {
+ dev_err(dev, "failed to get imx8mq usb phy clock\n");
+ return PTR_ERR(imx_phy->clk);
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ imx_phy->base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(imx_phy->base))
+ return PTR_ERR(imx_phy->base);
+
+ imx_phy->phy = devm_phy_create(dev, NULL, &imx8mq_usb_phy_ops);
+ if (IS_ERR(imx_phy->phy))
+ return PTR_ERR(imx_phy->phy);
+
+ phy_set_drvdata(imx_phy->phy, imx_phy);
+
+ phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+
+ return PTR_ERR_OR_ZERO(phy_provider);
+}
+
+static const struct of_device_id imx8mq_usb_phy_of_match[] = {
+ {.compatible = "fsl,imx8mq-usb-phy",},
+ { },
+};
+MODULE_DEVICE_TABLE(of, imx8mq_usb_phy_of_match);
+
+static struct platform_driver imx8mq_usb_phy_driver = {
+ .probe = imx8mq_usb_phy_probe,
+ .driver = {
+ .name = "imx8mq-usb-phy",
+ .of_match_table = imx8mq_usb_phy_of_match,
+ }
+};
+module_platform_driver(imx8mq_usb_phy_driver);
+
+MODULE_DESCRIPTION("FSL IMX8MQ USB PHY driver");
+MODULE_LICENSE("GPL");